Add the null == and != comparison to the main branch with

optimizations & compilation

Author: TotalTechGeek

optimizer.js

@@ -144,7 +144,7 @@ function checkIdioms (logic, engine, above) {
       const comparisonFunc = comparison.length === 3
         ? _comparisonFunc
         : function comparisonFunc (a, b) {
-          if (typeof a === 'string' && typeof b === 'string') return _comparisonFunc(a, b)
+          if ((typeof a === 'string' || a === null) && (typeof b === 'string' || b === null)) return _comparisonFunc(a, b)
           if (Number.isNaN(+precoerceNumber(a))) throw NaN
           if (Number.isNaN(+precoerceNumber(b)) && a !== null) throw NaN
           return _comparisonFunc(+a, +b)

package.json

@@ -1,6 +1,6 @@
 {
   "name": "json-logic-engine",
-  "version": "5.0.3",
+  "version": "5.0.4",
   "description": "Construct complex rules with JSON & process them.",
   "main": "./dist/cjs/index.js",
   "module": "./dist/esm/index.js",

utilities/downgrade.js

@@ -59,8 +59,7 @@ export function assertAllowedDepth (item, depthAllowed = 0) {
  * @returns {number}
  */
 export function compareCheck (item, prev, strict) {
-  if (strict || (typeof item === 'string' && typeof prev === 'string')) return item
-
+  if (strict || ((typeof item === 'string' || item === null) && (typeof prev === 'string' || prev === null))) return item
   if (Number.isNaN(+precoerceNumber(item)) && prev !== null) throw NaN
   if (Number.isNaN(+precoerceNumber(prev))) throw NaN